Surface light-emitting device

Abstract

A surface light-emitting device includes a light guide plate ( 1 ) comprising glass plates ( 12 ) respectively in close contact with and fixed to both surfaces of a resin plate ( 11 ) via adhesive layers ( 14 ), and a light source ( 2 ) for causing light to enter the light guide plate from one end surface of the light guide plate ( 1 ). As the light source ( 2 ), a light source having a blue central wavelength in a wavelength range of 460 nm or more and 490 nm or less, or a light source having a blue central wavelength in a wavelength range of 440 nm or more and less than 460 nm and having a color temperature of 4,000 K or lower is used.

1 . A surface light-emitting device, comprising:
 a light guide plate; and   a light source for causing light to enter the light guide plate from at least one end surface of the light guide plate,   the light guide plate comprising:
 a resin plate; 
 glass plates respectively in close contact with and fixed to both surfaces of the resin plate via adhesive layers each comprising an adhesive; and 
 a light scattering portion for guiding light propagating within the resin plate and the glass plates to an outside, 
   the light source having a blue central wavelength in a wavelength range of 460 nm or more and 490 nm or less.   
     
     
         2 . A surface light-emitting device, comprising:
 a light guide plate; and   a light source for causing light to enter the light guide plate from at least one end surface of the light guide plate,   the light guide plate comprising:
 a resin plate; 
 glass plates respectively in close contact with and fixed to both surfaces of the resin plate via adhesive layers each comprising an adhesive; and 
 a light scattering portion for guiding light propagating within the resin plate and the glass plates to an outside, 
   the light source having a blue central wavelength in a wavelength range of 440 nm or more and less than 460 nm and a color temperature of 4,000 K or lower.   
     
     
         3 . The surface light-emitting device according to  claim 1 , wherein the light scattering portion is formed on a surface of any one of the resin plate and the glass plates and is covered with the adhesive layer. 
     
     
         4 . The surface light-emitting device according to  claim 1 , wherein the light scattering portion is formed on a surface of the resin plate. 
     
     
         5 . The surface light-emitting device according to  claim 1 , wherein the light scattering portion is formed on a surface of any one of the resin plate and the glass plates by printing a pattern with paint or ink containing a light scattering agent. 
     
     
         6 . The surface light-emitting device according to  claim 1 , wherein the resin plate has a thickness that is larger than a thickness of each of the glass plates. 
     
     
         7 . The surface light-emitting device according to  claim 1 , wherein the glass plates each have a thickness of from 0.05 mm to 1 mm. 
     
     
         8 . The surface light-emitting device according to  claim 1 , wherein the light source comprises an LED. 
     
     
         9 . The surface light-emitting device according to  claim 2 , wherein the light scattering portion is formed on a surface of any one of the resin plate and the glass plates and is covered with the adhesive layer. 
     
     
         10 . The surface light-emitting device according to  claim 2 , wherein the light scattering portion is formed on a surface of the resin plate. 
     
     
         11 . The surface light-emitting device according to  claim 2 , wherein the light scattering portion is formed on a surface of any one of the resin plate and the glass plates by printing a pattern with paint or ink containing a light scattering agent. 
     
     
         12 . The surface light-emitting device according to  claim 2 , wherein the resin plate has a thickness that is larger than a thickness of each of the glass plates. 
     
     
         13 . The surface light-emitting device according to  claim 2 , wherein the glass plates each have a thickness of from 0.05 mm to 1 mm. 
     
     
         14 . The surface light-emitting device according to  claim 2 , wherein the light source comprises an LED.